TAS5558　SDOUT after　DAP Processing

Hi Y. Hasebe,

What setting do you have on register 0x04 bit D0? Are you able to get audio out on the PWM outputs? or are you getting no audio out at all?

Justin

Hello Justin-san,

Thank you for your reply.

What setting do you have on register 0x04 bit D0?

⇒Because it was considered to be necessary because the following description.

0x04 D0⇒”１”：Output Downmix on SDOUT. Dolby-out is enabled when this bit is set and system is in normal mode

　Does this setting is not required?

Are you able to get audio out on the PWM outputs?

⇒My customers used TAS5624AEVM(with Input USB Board3)

   Then they are monitoring the analog waveform by connecting the SDOUT to another circuit.

　They already have confirmed the ON / OFF of SDOUT by changing the D8,9,16 of 0xC5.

　But, they can not be confirmed output after the DAP process.

　I want to know whether other certain registers required in this setting.

Best Reagrds,

Y.Hasebe

　

Hi Y. Hasebe,

You must disable the Dolby Downmix as it sources the audio from the inputs directly and does not go through the DAP to output on SDOUT. If you disable Dolby Downmix, and you have D8 and D9 set to 11, then you should get output on SDOUT from the DAP.

Justin

Hello Justin-san,

Thank you for your reply.
I think that disable of Dolby downmix means register follows.
"0x04 D0　1⇒0"．
Is this correct?
Are there are other necessary registers change?

Best　Regards,
Y.Hasebe

Hello Justin-san,

I tried to check sdout by TAS5548EVM &PPC1.16.

Setting of resister 0xC5:

1.I changed "0x04 D0　1⇒0"．

   ⇒Data is not output to SDOUT.

2.I changed "0x04 D0　0⇒1"．

  ⇒Data is output to SDOUT

3.Then, although the variable Volume, data SDOUT did not change.

I need your help.

Best Regards,

Y.Hasebe

Hi Hasebe-san,

What inputs are you using for audio input and have you made any changes to the input muxing?

Justin

Hello Justin-san,

Thank you for your reply.

I heard my customer your questions.

1.Audio Input : L/R(2ch) ,Optical input from Audio Precision

2.Input MUX: default setting

Best Regards,

Y. Hasebe

Hi Y. Hasebe,

Using the EVM and default GUI settings, with PSIA supplying the clocks at 48 kHz and data on SDIN1, changing the following registers enabled data output on SDOUT:

0xC5 00 00 03 00

Picture of the GUI:

I only needed to change the SDOUT enable bit, and the ASRC output channel. I am not sure what other settings could effect it, could you send me a register dump of your settings?

Justin

Hello Justin-san,

Thank you for your reply.

I will send to you attached file.

Please check this.

Best Regards,

Y.Hasebe

SDOUT.cfg

Hi Y.Hasebe,

I have SDOUT working with your script, were you also successful in getting SDOUT to work? I will have to look into the options of what filters you can use on SDOUT, I will look into this on Monday.

Justin

Hello　Justin-san,

Thank you for your reply.
Were you also successful in getting SDOUT to work?
⇒Not Yet.
I will have to look into the options of what filters you can use on SDOUT, I will look into this on Monday.
⇒ My customer will use EQ & Volume Control.

By the way,
Do you have a CFG file that successfully SDOUT after DAP processing?
If you have a file, could you please give it to me?

Best Regards,
Y.Hasebe

Hi Y.Hasebe,

I used your SDOUT.cfg file and was able to get SDOUT working after the DAP. I believe that SDOUT after the DAP only has the ability to be downmixed, and there is no EQ or volume available.

Justin

Hello Justin-san,

Thank you for your reply.

Does your reply, you mean that SDOUT can not output changing the EQ & Volume?
I did not find that information on the data sheet.
I look at the data sheet, the output after the DAP process will think that we can to be able to use all DAP features.
(My customer is also kind of recognition.)
Could you please tell me if you "SDOUT after the DAP only has the ability to be downmixed" knew is seen described.

Best Regards,

Y.Hasebe

Hi Y.Hasabe,

The SDOUT signals that are after the DAP can only be Dolby down-mixed, and do not have volume or EQ control. Figure 38 in the data sheet shows the Dobly down mix from input to output, only showing coefficients for mixing channels together.

Justin

Hello Justin-san,

Thank you for your reply.

I understand that SDOUT don't  have volume or EQ control.

Then i have one more question.

There is a description of the "I2S Out for External Wireless Sub" on the first page of the data sheet.
About SDOUT,
Please tell me the relationship between treatment and the contents of the Downmix only in DAP.
(In particular how to use the "Wireless Sub")

Best Regards,

Y.Hasebe

Hello　Justin-san,

Could you please  give me information about the following questions that sent last week.

I received the same question from my customer.

There is a description of the "I2S Out for External Wireless Sub" on the first page of the data sheet.
About SDOUT,
Please tell me the relationship between treatment and the contents of the Downmix only in DAP.
(In particular how to use the "Wireless Sub")

Best　Regards,

Y.Hasebe

Hi y.Hasebe,

Wireless sub woofer is used as an example, the SDOUT is either a Dolby downmix from the DAP output or a selected 2 channel output from one of the ASRCs. This output can be used for anything, such as being I2S output that goes into an amplifier that can drive any type of speaker and filters can be applies in the amplifier, or in some external processor. one example that was thought of a useful example was that it could be used for a sub woofer, since this part was targeted at AVR and TV applications with surround sound.

Justin

Hello Justin-san,

Thank you  for your reply.

And I'm sorry reply rate.

I understand your explanation.

Then I had answered t to my customer.

Best Regards,

Y.Hasebe

Hello Justin-san,

My customer asked us additional question.

Please tell me how to output the SDIN2 only to SDOUT.

Then I think following setting.
1.TAS5558 setting
1) resister (0x04) D0⇒1
2) resister (0xC5) D24⇒0,D25⇒1

Please tell me how to connect in the "Input USB Board" of this case.

Best Regards,
Y.Hasebe

Hello Justin-san,

My customer want to use SDOUT as for ExternalSUBWoofer.
He wants to output only SDIN2 to SDOUT.
Also he used TAS5624A+InputUSB Board and Purepath Console.

So, could you please tell me how to set above condition.

Best Regards,
Y.Hasebe

Hi Y.Hasebe,

The only change you need to make to get SDIN2 out on DOUT instead of SDIN1, is to set 0xC5 D9 -> 1 and D8 -> 0. There is a typo in the data sheet, so on the next page it has the wrong bit numbers at the top of the table.

Justin